timothy fong of ucla says he sees patients just like her every day. >> the average age of our patient is about 40. we've seen housewives, we've seen doctors, we've seen lawyers. the stereotype of the video game addict is a teenage kid in his underwear. that's not what's happening out there. >> reporter: the american psychological association has so far declined to recognize video game addiction as a diagnosis. but the apa lists video game psychologist as a hot career, because the gaming industry is highing psychologists as consultants to make their games more inticing. ariella leher, a trained psychologist designs games for middle aged women. >> our most popular title is called "murder she wrote." >> reporter: the content romance and mystery. but the psychology pure las vegas. >> i think there's a lot to learn from las vegas. >> reporter: for instance intermittent rewards. >> the rewards, the money in the cash drawer, don't come ever single time. we learned this with rats. with food pedal press. >> reporter: some games follow a six second rule. every six seconds a visual sparkle to en